In The timeline section of the visual add the month count, from where the project starts, month #1, to where the project ends.
Currently the visual does show the month number, January being month 1 and December month
12, but it goes back to month 1 in the next year in January , it doesn't keep counting:
Add to as optional visualization; to all see the Cardinal order month 1 (month star) to XX month when project ends:
So you can easily see which month number, assuming 1st month the start of the project and month 34th the end in the example above, has certain task started and ended.